feraiseexcept(3p) — Linux manual page


FERAISEEXCEPT(3P)         POSIX Programmer's Manual        FERAISEEXCEPT(3P)

PROLOG         top

       This manual page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the
       corresponding Linux manual page for details of Linux behavior), or
       the interface may not be implemented on Linux.

NAME         top

       feraiseexcept — raise floating-point exception

SYNOPSIS         top

       #include <fenv.h>

       int feraiseexcept(int excepts);

DESCRIPTION         top

       The functionality described on this reference page is aligned with
       the ISO C standard. Any conflict between the requirements described
       here and the ISO C standard is unintentional. This volume of
       POSIX.1‐2008 defers to the ISO C standard.

       The feraiseexcept() function shall attempt to raise the supported
       floating-point exceptions represented by the argument excepts.  The
       order in which these floating-point exceptions are raised is
       unspecified. Whether the feraiseexcept() function additionally raises
       the inexact floating-point exception whenever it raises the overflow
       or underflow floating-point exception is implementation-defined.

RETURN VALUE         top

       If the argument is zero or if all the specified exceptions were
       successfully raised, feraiseexcept() shall return zero. Otherwise, it
       shall return a non-zero value.

ERRORS         top

       No errors are defined.

       The following sections are informative.

EXAMPLES         top



       The effect is intended to be similar to that of floating-point
       exceptions raised by arithmetic operations. Hence, enabled traps for
       floating-point exceptions raised by this function are taken.

RATIONALE         top

       Raising overflow or underflow is allowed to also raise inexact
       because on some architectures the only practical way to raise an
       exception is to execute an instruction that has the exception as a
       side-effect. The function is not restricted to accept only valid
       coincident expressions for atomic operations, so the function can be
       used to raise exceptions accrued over several operations.



SEE ALSO         top

       feclearexcept(3p), fegetexceptflag(3p), fetestexcept(3p)

       The Base Definitions volume of POSIX.1‐2008, fenv.h(0p)

COPYRIGHT         top

       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information
       Technology -- Portable Operating System Interface (POSIX), The Open
       Group Base Specifications Issue 7, Copyright (C) 2013 by the
       Institute of Electrical and Electronics Engineers, Inc and The Open
       Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
       applied.) In the event of any discrepancy between this version and
       the original IEEE and The Open Group Standard, the original IEEE and
       The Open Group Standard is the referee document. The original
       Standard can be obtained online at http://www.unix.org/online.html .

       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the
       source files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                 2013                   FERAISEEXCEPT(3P)

Pages that refer to this page: fenv.h(0p)feclearexcept(3p)fegetexceptflag(3p)fetestexcept(3p)